\begin{itemize}

 \item does not start on line does not start on line does not start on line oes
 not start aa a a a a a a a a a a a a a a a a a a a a a a a a a a a a aa a a a
 a a a a a a a a a a a a a a a a

 Recall Euler's formula for planar graphs, \(V+E-F=2\).
 \item
 starts on own line starts on own line starts on own line aa a a a a a a a a a
 a a a a a a a a a a a a a a a a a a a aa a a a a a a a a a a a a a a a a a a a
 \begin{itemize}

  \item Let \(G\) be a maximal planar graph; we wish to show that every drawing
  of \(G\) has only triangular faces (counting the ``unbounded'' face also as a
  triangle).

  Recall Euler's formula for planar graphs, \(V+E-F=2\).

 \end{itemize}

\end{itemize}
----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|
   5   10   15   20   25   30   35   40   45   50   55   60   65   70   75   80   85   90